I agree with BruceH. The low use in 12 years is not a big concern to me. The maintenance that it may or may not have received over those years could be an important consideration though.
I have lots of vehicles and many are driven less than 2,000 miles a year. All get an oil change at least annually regardless of miles. On a 986 with that few miles over 12 years, I'd be concerned about catching up a lot of maintenance if it wasn't documented during that time:
- Water pump
- Tires
- AOS
- Coolant tank - inspect for stress cracks and yellowing, replace if needed
- Engine & Transmission mounts
- Belt (and inspect hoses)
- Axle boots
- Fluids - Engine, transmission, and brake.
- Lube all the joints of the top mechanism.
There's more, but that would be my immediate list before putting on lots of miles. Plan to replace and repair a few things as needed in the near future due to age (window regulators, suspension parts, Oxygen sensors...)